EFFECT OF CARBON TO NITROGEN RATIO ON MIXTURE OF COW AND CHICKEN MANURE ON THERMOPHILIC FERMENTATION IN PRODUCING BIOGAS

Biogas is an alternative energy in the form of methane (CH4) which can be used as a fuel. It is formed from the decomposition of organic material through an anaerobic fermentation process carried out by anaerobic bacteria. Temperature is one of the important factors that influence the fermentation process. This study aims to determine the effectiveness of the C/N ratio in producing biogas under thermophilic conditions (55ºC) with variations in the ratio of C/N. Meanwhile, the C/N ratio used was 30, 35, 40, and the substrate without a change in the C/N ratio, respectively. This study uses glucose and ammonium sulfate to regulates the C/N ratio, where glucose has a function to increase carbon while ammonium sulfate is used to increase nitrogen. The results of this study conducted for 30 days revealed that the substrate with C/N ratio 35 and 40 with the addition of glucose has the highest biogas production volume. Production of biogas volume for C/N 30 substrate ratio has the lowest yield. The production of biogas in a thermophilic process has been shown to produce a higher volume of biogas than the mesophilic process with the same C/N ratio.